.bottom_ul{
    width: 100%;
    overflow: hidden;
    height: 50px;
    position: fixed;
    bottom: 0;
    background-color: #fafafa;
}
.bottom_ul li{
    width: 33.3%;
    height: 50px;
    float: left;
   position: relative;
}
.bottom_ul li i{
    position: absolute;
    left: 50%;
    top: 50%;
    margin-top: -22px;
    margin-left: -15px;
}
.bottom_ul li span{
    position: absolute;
    bottom: 1px;
    width: 100%;
    text-align: center;
    color: black;
}